1 /*- 2 * Copyright (c) 1992 Henry Spencer. 3 * Copyright (c) 1992 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Henry Spencer of the University of Toronto. 8 * 9 * %sccs.include.redist.c% 10 * 11 * @(#)regexec.c 5.2 (Berkeley) 09/30/92 12 */ 13 14 #if defined(LIBC_SCCS) && !defined(lint) 15 static char sccsid[] = "@(#)regexec.c 5.2 (Berkeley) 09/30/92"; 16 #endif /* LIBC_SCCS and not lint */ 17 18 /* 19 * the outer shell of regexec() 20 * 21 * This file includes engine.c *twice*, after muchos fiddling with the 22 * macros that code uses. This lets the same code operate on two different 23 * representations for state sets. 24 */ 25 #include <sys/types.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <limits.h> 30 #include <ctype.h> 31 #include <regex.h> 32 33 #include "utils.h" 34 #include "regex2.h" 35 36 /* macros for manipulating states, small version */ 37 #define states long 38 #define states1 states /* for later use in regexec() decision */ 39 #define CLEAR(v) ((v) = 0) 40 #define SET0(v, n) ((v) &= ~(1 << (n))) 41 #define SET1(v, n) ((v) |= 1 << (n)) 42 #define ISSET(v, n) ((v) & (1 << (n))) 43 #define ASSIGN(d, s) ((d) = (s)) 44 #define EQ(a, b) ((a) == (b)) 45 #define STATEVARS int dummy /* dummy version */ 46 #define STATESETUP(m, n) /* nothing */ 47 #define STATETEARDOWN(m) /* nothing */ 48 #define SETUP(v) ((v) = 0) 49 #define onestate int 50 #define INIT(o, n) ((o) = 1 << (n)) 51 #define INC(o) ((o) <<= 1) 52 #define ISSTATEIN(v, o) ((v) & (o)) 53 /* some abbreviations; note that some of these know variable names! */ 54 /* do "if I'm here, I can also be there" etc without branches */ 55 #define FWD(dst, src, n) ((dst) |= ((src)&(here)) << (n)) 56 #define BACK(dst, src, n) ((dst) |= ((src)&(here)) >> (n)) 57 #define ISSETBACK(v, n) ((v) & (here >> (n))) 58 /* function names */ 59 #define SNAMES /* engine.c looks after details */ 60 61 #include "engine.c" 62 63 /* now undo things */ 64 #undef states 65 #undef CLEAR 66 #undef SET0 67 #undef SET1 68 #undef ISSET 69 #undef ASSIGN 70 #undef EQ 71 #undef STATEVARS 72 #undef STATESETUP 73 #undef STATETEARDOWN 74 #undef SETUP 75 #undef onestate 76 #undef INIT 77 #undef INC 78 #undef ISSTATEIN 79 #undef FWD 80 #undef BACK 81 #undef ISSETBACK 82 #undef SNAMES 83 84 /* macros for manipulating states, large version */ 85 #define states char * 86 #define CLEAR(v) memset(v, 0, m->g->nstates) 87 #define SET0(v, n) ((v)[n] = 0) 88 #define SET1(v, n) ((v)[n] = 1) 89 #define ISSET(v, n) ((v)[n]) 90 #define ASSIGN(d, s) memcpy(d, s, m->g->nstates) 91 #define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0) 92 #define STATEVARS int vn; char *space 93 #define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \ 94 if ((m)->space == NULL) return(REG_ESPACE); \ 95 (m)->vn = 0; } 96 #define STATETEARDOWN(m) { free((m)->space); } 97 #define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates]) 98 #define onestate int 99 #define INIT(o, n) ((o) = (n)) 100 #define INC(o) ((o)++) 101 #define ISSTATEIN(v, o) ((v)[o]) 102 /* some abbreviations; note that some of these know variable names! */ 103 /* do "if I'm here, I can also be there" etc without branches */ 104 #define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here]) 105 #define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here]) 106 #define ISSETBACK(v, n) ((v)[here - (n)]) 107 /* function names */ 108 #define LNAMES /* flag */ 109 110 #include "engine.c" 111 112 /* 113 - regexec - interface for matching 114 = extern int regexec(const regex_t *preg, const char *string, size_t nmatch, \ 115 = regmatch_t pmatch[], int eflags); 116 = #define REG_NOTBOL 00001 117 = #define REG_NOTEOL 00002 118 = #define REG_STARTEND 00004 119 = #define REG_TRACE 00400 120 = #define REG_LARGE 01000 121 = #define REG_BACKR 02000 122 * 123 * We put this here so we can exploit knowledge of the state representation 124 * when choosing which matcher to call. Also, by this point the matchers 125 * have been prototyped. 126 */ 127 int /* 0 success, REG_NOMATCH failure */ 128 regexec(preg, string, nmatch, pmatch, eflags) 129 const regex_t *preg; 130 const char *string; 131 size_t nmatch; 132 regmatch_t pmatch[]; 133 int eflags; 134 { 135 register struct re_guts *g = preg->re_g; 136 #ifdef REDEBUG 137 # define GOODFLAGS(f) (f) 138 #else 139 # define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND)) 140 #endif 141 142 if (preg->re_magic != MAGIC1 || g->magic != MAGIC2) 143 return(REG_BADPAT); 144 assert(!(g->iflags&BAD)); 145 if (g->iflags&BAD) /* backstop for no-debug case */ 146 return(REG_BADPAT); 147 eflags = GOODFLAGS(eflags); /* xxx should we complain? */ 148 149 if (g->nstates <= CHAR_BIT*sizeof(states1) && !(eflags®_LARGE)) 150 return(smatcher(g, (uchar *)string, nmatch, pmatch, eflags)); 151 else 152 return(lmatcher(g, (uchar *)string, nmatch, pmatch, eflags)); 153 } 154